Cleaning brush



FIG. 1 is a front, right and top perspective view of a cleaning brush showing my new design;

FIG. 2 is a rear, left, and bottom perspective view of the cleaning brush shown in FIG. 1;

FIG. 3 is a right side elevational view of the cleaning brush shown in FIG. 1; and,

FIG. 4 is a top plan view of the cleaning brush shown in FIG. 1. 

The ornamental design for a cleaning brush, as shown and described. 